engleski

Effect of pre-swirl stator on the hydrodynamic performances of hydrokinetic turbines

Advances in renewable energy technology have very important role in reaching ambitious goal of net zero emissions by 2050. Hydrokinetic technology is emerging renewable energy technology, used to convert mostly untapped energy of waves, tides, river and ocean currents. In order to improve hydrodynamic performances of horizontal axis hydrokinetic turbines, that are the most common hydrokinetic energy conversion devices, design improvements are investigated in this paper. The pre-swirl concept is proposed for hydrokinetic turbines in order to reduce losses caused by secondary flow. This concept assumes stator blades that are mounted in the front of propeller and used to redirect coming flow. The stator blades direct the flow in the opposite direction to the rotor rotation which causes vortex formation that is approximately equal to the vortex created by the rotor but with rotation in opposite direction. This concept is well known in marine propeller technology but has only recently been considered for horizontal axis turbines. Numerical simulations were performed using computational fluid dynamics to quantify the improvement effect of the pre-swirl concept on the hydrodynamic performances of horizontal axis turbines for river and marine current applications.

hydrokinetic turbine ; pre-swirl concept design improvements ; marine current turbines ; river current turbines

nije evidentirano